(Sunday, 7/29/2018) 3:00 PM - 6:00 PM
Room: Exhibit Hall
Purpose: The objective of the present study is to investigate the stability of targeting accuracy of various tracking methods in Cyberknife Robotic Radiosurgery system from E2E results over a period of five years.
Methods: Cyberknife is the frameless radiosurgery system which uses 6D Skull, X-Sight Spine, X-Sight Lung, Fiducial and Synchrony tracking methods for treating different sites. As per specifications, the overall targeting accuracy for static target and moving target is less than 0.95 mm less than 1.5 mm. To check the targeting accuracy, dedicated skull, lung and synchrony phantoms are used. CT images of the E2E phantoms are taken with 1mm slice thickness for better DRR generation in Treatment Planning system and QA plans are generated as per the procedure. The plans were executed in the E2E phantoms and results were analyzed using the dedicated E2E software. We analyzed the results for various targeting methods over a period of five years for four different tracking methods.
Results: Analyzing E2E results with 57 measurements for 6D Skull, we got minimum and maximum targeting error as 0.14 mm and 1.12 mm with standard deviation of 0.211 mm. E2E results with 58 measurements for X-Sight spine, the minimum and maximum targeting error was 0.09 mm and 0.98 mm with standard deviation of 0.209 mm. Analyzing E2E results with 44 measurement for X-Sight Lung, the minimum and maximum targeting error was 0.01 mm and 1.15 mm with a standard deviation of 0.353 mm. E2E results with 54 measurements for Fiducials, the minimum and maximum targeting error was 0.15 mm and 1.06 mm with a standard deviation of 0.221 mm.
Conclusion: On analyzing E2E results for different tracking methods over a period of five years, we could see that, mechanical stability of the Cyberknife was consistent and well with in the tolerance.
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